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- W2101002012 abstract "The murine alpha B-crystallin/small heat shock protein gene is expressed at high levels in the lens and at lower levels in the heart, skeletal muscle, and numerous other tissues. Previously we have found a skeletal-muscle-preferred enhancer at positions -427 to -259 of the alpha B-crystallin gene containing at least four cis-acting regulatory elements (alpha BE-1, alpha BE-2, alpha BE-3, and MRF, which has an E box). Here we show that in transgenic mice, the alpha B-crystallin enhancer directs the chloramphenicol acetyltransferase reporter gene driven by the alpha B-crystallin promoter specifically to myocardiocytes of the heart. The alpha B-crystallin enhancer was active in conjugation with the herpes simplex virus thymidine kinase promoter/human growth hormone reporter gene in transfected rat myocardiocytes. DNase I footprinting and site-specific mutagenesis experiments showed that alpha BE-1, alpha BE-2, alpha BE-3, MRF, and a novel, heart-specific element called alpha BE-4 are required for alpha B-crystallin enhancer activity in transfected myocardiocytes. By contrast, alpha BE-4 is not utilized for enhancer activity in transfected lens or skeletal muscle cell lines. Alpha BE-4 contains an overlapping heat shock sequence and a reverse CArG box [5'-GG(A/T)6CC-3']. Electrophoretic mobility shift assays with an antibody to serum response factor and a CArG-box-competing sequence from the c-fos promoter indicated that a cardiac-specific protein with DNA-binding and antigenic similarities to serum response factor binds to alpha BE-4 via the reverse CArG box; electrophoretic mobility shift assays and antibody experiments with anti-USF antiserum and heart nuclear extract also raised the possibility that the MRF E box utilizes USF or an antigenically related protein. We conclude that the activity of the alpha B-crystallin enhancer in the heart utilizes a reverse CArG box and an E-box-dependent pathway." @default.
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- W2101002012 date "1995-12-01" @default.
- W2101002012 modified "2023-10-16" @default.
- W2101002012 title "Regulation of the Murine αB-Crystallin/Small Heat Shock Protein Gene in Cardiac Muscle" @default.
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- W2101002012 doi "https://doi.org/10.1128/mcb.15.12.7081" @default.
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